There is a limit to the number of activities that can be executed in a BPEL process. When you exceed this limit, system memory fills up, which can cause timeouts to occur. For example, with the following parameters, two fault instances occur due to a timeout:

• 100 threads

• 1 second of think time

• 1000 incoming request messages

Keep the number of incoming request messages at a proper level to ensure system memory stability.